Driving means for the idle rolls of rolling mills



Dec. 8, 1925' R. HElN DRIVING MEANS FOR THE IDLE ROLLS 0F ROLLING MILLS Filed April 13. 1923 2 Sheets-Sheet 1 Dec. 8, 1925- R. HEIN DRIVING MEANS FOR THE IDLE ROLLS 0F ROLLING MILLS Filed April 1:5. 1923 2 sheets-Sheet 2 Patented Dec. 8, 1925.

UNITED STATES RICHARD 'HEIN, 0F WI'IKOWITZ, CZECHOSLOVAKIA.

DRIVING MEANS FOR THE IDLE ROLLS OF ROLLING EILLS.

' Application fled A ru a, 1923.. Serial No. 631,892.

, idle roll.

In a sort of mills of the kind hitherto used the idle roll is taken along by friction of the power-driven roll.

Machines of this sort are subject to heavy shocks on the introduction of the iron-bar dueto the jumping of the idle roll, and all the arts of the mill, such as the roll supporting members, the housings or hearing shells and the pressure screws are liable to be damaged by such jumping of the idle roll and the heavy shocks arising therefrom. In the use of the type hitherto designedthis disadvantage cannot be avoided, since there must be suflicient play or clearance between the bearings and the pressure screws, as required by the thickness of the bar to be introduced between the two rolls. The idle roll however must rotate at the moment of introducing the bar, because otherwise the bar would not be gripped by and between the rolls.

The objection of this invention therefore resides in the means for imparting a temporary rotation to the idle or friction-roll for the purpose of avoiding thereby the described shocks, which in case of high rolling velocities are very strong and may seriously damage the mill.

With this other in view the trunnions of the rolls are provided with axially displaceable gearings through which the idle roll will be driven by the power-driven roll acting as the driving member, so that the idle roll at the moment of introducing the bar is given the required rotary motion to introduce the bar, while the transmission of movement will be discontinued as soon as the bar has been gripped by the rolls, whereupon the idle roll continues to ro- -tive drive at proper times.

tate owing to the frictional contact with the bar.

In order to allow the gearing member carried by the trunnion of the upper or idle roll being displaced in horizontal or axial direction, a lever arrangement may be provided comprising two interconnected levers with their operating ends attached to rings associated with the two gearing members of the rolls. The outer or controlling ends or arms of the said two levers may be suitably connectedby a cross-bar having a hole midway between its ends for a threaded spindle or screws to ass therethrough. Said spindle or screw is connected by suitable intermediate means with one of the standards of the mill or the crossbeam at the top thereof.

I am aware of the fact that gearing, in particular frictional gearings have been in use heretofore for positively and continuously driving rolls in rolling mills. According to my invention however the drive is provided for the sole purpose of actuating or driving the idle roll at certain moments, or periodically only, while after the introduction of the work-piece the said roll will act as an idle roll taken along by friction with the work-piece only. To this end means for horizontally or axially displacing-the gearing member are provided in order to start and to discontinue the posi- My invention is mainly adapted for use in connection with rolling mills having their rolls journaled in hearings in which there is no adjustment required, to compensate for wear of the brasses or shells.

Referring to the accompanying drawings, which illustrate by way of example two embodiments of the invention, to the details of construction of which the invention is not limited however,

Figure 1 is an end elevation of a rolling mill having two rolls equipped with the new means embodying the invention.

Figure 2 is a vertical, longitudinal sectional view thereof and Figure 3 is a ;front elevation showing partly in section a similar mill with a modified embodiment of the invention.

In the embodiment of the invention illustrated in Figures 1 and 2 the upper roll 0 and the lower roll U are journalled in bearings a? and a with brasses Z and Z respectively. The superposed bearings with the rolls sup orted therein are firmly held in place in t e usual manner by means of a top structure B and screws D. 1

Mounted .on the t-runnions K and 1K and the gudgeons V V axially projecting therefrom, are two frictional bevel gears R and B .respectively. The gear R of the upper roll is adapted to be brought into engagement with the gear R of the power-driven roll U by means of two levers H pivotally connected by means of pins Z and 2*, respectively with a loose ring seated on the elongated hub of the gear R and with a loose ring r seated onthe elongated hub-of the other gear, "R The two levers are connected. together attheir.

upper endsgby-fa cross-bar 3- T.' The said cross-bar 'Thas'an openingor hole midway between its twdends for the reception of a threaded spi'ndlefor' screws S carrying a nut with a hand-wheelH, said hole being of .sufiicient width to allow the cross-bar to freely move over the spindle, when being displaced. by means of the nut and handwheel H The spindle S is connected to a bracket K rigidly attached to the cap of the standard W by means of bolts or the like.

Interposed between the nut and the crossbar T is a spirally coiled spring F. By

screwing the nut with the handle l-I down on the spindle S the interconnected levers H are caused to move the gear R in en-- gagement with the gear R so that the power driven roll U then will transmit its rotary movement to the upper roll 0 through the agency of the and R y In order to prevent the gear R in case of an accidental stoppage or obstruction from sliding on the gear R the s indle or screw S is provided with an angu ar slot 8 in which a pin Z) engages, so that the said spindle or screw can be displaced and tilted over into the position indicated by dotted lines. In this position the pin 12 engages in the outer end of the angular slot 8, as shown, and the gear R will be released thereby, so as to be out of engagement with the gear R F or the purpose of expediting the disengagement of the gearing, coiled springs may be inserted in recesses of the gear R and a diskn. may be provided on the trunnion h for springs f to abut thereagainst, as will be clearly understood on inspection of-Figure 2.

In the modification illustrated in Figure 3 the sleeve M of the lower roll U carries a toothed wheel or rim 2 which is keyed to the said sleeves and meshes with a inion 2 The latter is keyed to the trunnion of the upper roll 0 and a conical disk S is rigidly connected therewith by means of bolts B The said disk, S is mounted clearly understood from the gearing R with its laterally projectin conical annular flange 54 upon a conica friction wheel or ring R firmly afiixed to the trunnion K of the upper roll 0. The conical disk S is caused to frictionally engage with conical ring R by means of a screw S in a bow D rigidly connected with the pinion 2 In this embodiment of the invention the upper roll 0 is positively driven by the power-driven roll U so that the work or bar to can be inserted betweenthe two rolls without any danger of detrimental shocks. There is no possibility for heavier stresses to act-in the-driving mechanism, since the conical disk S in. the event of such stresses occurring accidentally will at once slide off the'friction ring B, so that no damage can be done by excessive stresses. As will be shocks are fully avoided also in this modification of the invention and the bar can be introduced between the rolls while the properly adjusted upper roll 0 is rotating to its positive drive from the lower roll through the described intermediate driving means.

From the foregoing description. it will be seen that simple and eflicient means are herein provided for accomplishing the objcct of my invention but while the elements shown and described are well adapted to serve the purposes for which they are intended, it is to be understood that the invention is not limited to the precise construction set forth, but includes such changes as may be made within the scope -.and spirit of the appended claims.

What I claim is:

1. The combination in a rolling mill of an idle or secondary roll with an axially displaceable frictional bevel gear on said roll, a driving roll, a frictional bevel gear connected therewith, rings on said gear and a pair of interconnected levers connected with said rings for throwing the first stated gear in and out of engagement with the other gear substantially as described.

2. The combination in a rollin mill of a secondary roll, with an axially dlsplaceable frictional bevel gear on said roll, a driving roll, a frictional bevel gear connected therewith, rings on said gears, pivots on said rings and a pair of interconnected levers attached to said pivots substantially as described and for the purpose set forth.

3. The combination in a rolling mill of a secondary roll with an axially displaceable frictional bevel gear on said roll, a driving roll, a frictional bevel gear connected therewith, rings on said gears, a pair of levers pivotally connected with said rings, a crossbar interconnecting the two levers, standards supporting the two rolls and a threaded spindle firmly attached to a standard and affording a sliding seat for the said crossshowing,

bar substantially as described and for the purpose set forth.

4. The combination in rolling mill of a secondary roll with an axially displaceable frictional bevel gear in said roll, a driving roll, a frictional bevel gear connected therewith, rings on said gears, a pair of levers pivotally connected with said rings, a crossbar interconnecting the two levers, standards supporting the two rolls, a threaded spindle firmly attachedto a standard and ait'ording a sliding seat to the said cross-bar and a nut with a handle on said spindle, substantially as described and for the purpose set forth.- 1

5. The combination in a rolling mill of a secondary roll, with an axially displaceable frictional bevel gear on said roll, a driving roll, a frictional bevel gear connected therewith, rings on said gears, a pair of levers pivotally connected with said rings, a crossbar interconnecting the said levers standards supporting the two rolls, a threaded spindle firmly attached to a standard and affording a sliding seat to the cross-bar, a nut with a handle on said spindle and a spiral spring interposed between saidnut and thecrossbar substantially as described and for the purpose set forth.

6. The combination in a rolling mill of a primary roll, a secondary roll with an axially displaceable frictional bevel gear connected therewith, rings in said gears, a pair of levers pivotally connected with the said rings, a cross-bar interconnecting the said levers, standards supporting the rolls, a threaded spindle attached to a standard and affording a sliding seat to the cross-bar, a bracket on said standard as an intermediate means for pivotally connecting the said spindle with the standard and a nut with a handle on said spindle substantially as described and shown.

7. The combination in a rolling mill of a secondary roll with an axially displaceable March, 1923.

frictional bevel gear on said roll, a driving roll, a frictional bevel gear connected therewith, rings on said gears, a pair of levers pivotally connected with therings, a crossbar interconnecting the said levers, standards supporting the said rolls, a threaded spindle attached to a standard and affording a sliding seat to the cross-bar, a bracket on said standard serving as an intermediate means for pivotally connecting the spindle with the standard, a nut with a handle on said spindle and a spiral spring interposed between the nut and the cross-bar substantially as described and shown. 8. The combination in a rolling mill of a secondary or' idle roll with an axially displaceable frictional bevel gear on said roll, a driving roll, a frictional bevel gear connected therewith, rings on said gears, a pair of levers pivotally'connected with the rings, across-bar interconnecting the two levers, standards supporting the rolls, a threaded spindle attached to astandard and affording a sliding seat to the cross-bar a bracket on said standard serving as an intermediate means for connecting the spindle with'the standard, a nut with a handle on said spindle, a pin and slot connection between the bracket and the spindle and a spiral spring interposed between the nut and the cross-bar substantially as described and for the purpose set forth.

9. In a rolling mill, an idle roll, a driving roll, and gearing connecting said rolls, said gearing including a member axially movable on the idle roll, and active to cause the idle roll to be positively driven by the driving roll while said member is in one position, and to permit rotation of the driving roll-independently of the idle roll while said member is in another position.

In testimony whereof I have signed my name to this specification this 16th day of RICHARD HEI'N. 

